The trial of a Pensacola man accused of shooting a young woman in the head during a 2012 robbery chugged along Wednesday, but didn’t pick up much steam.

Robert Purifoy, 34, has been charged with premeditated first-degree murder in the death of 22-year-old Amber Johnson, who was killed in a shoot out-between Purifoy and her boyfriend, Justin Stanley. Purifoy allegedly broke into Stanley’s home on Stefani Circle to steal marijuana.

All but one of the bullets fired in the exchange were accounted for by forensic investigators, and the testimony in Purifoy’s trial Wednesday centered on where the missing bullet could have gone.

Both Purifoy and Stanley suffered non-fatal gunshot wounds in the exchange, and investigators think one of Stanley’s rounds became lodged in Purifoy’s back. While Purifoy was incarcerated in connection with the shooting, someone allegedly removed the bullet from Purifoy’s back and disposed of it.

In a grueling series of cross examinations, Purifoy’s defense attorney Cheryl Gooden grilled several investigators about other possible reasons why the bullet was never found. She proposed that the projectile could have been lodged underneath or behind furniture, been tracked outside on shoe soles or overlooked in a home that wasn’t examined with a “fine-toothed comb.”

The investigators agreed that such a scenario was possible but said they had no reason to suspect that was the case.

Testimony will continue in Purifoy’s trial Thursday morning. He faces up to life in prison if convicted.